Filter.



No. 653,|60. Patented July 3, 1900. J. E. WILLIAMSON.

F I L T E R (Application filed Nov. 21,

2. Shoots-4M0 I.

(No Model.)

FIG. 7.

Ill/III,

Fla. 2.

INVENTOR:

s Azzomeys.

% By kl THE NORRIS PETERS CO. PHMLII-LITNOH WASNINQTON. D,

WITNESSES:

llrrn JAMES E. WILLIAMSON, on NEW YORK, N. Y., ASSIGNOR TO HENRY l3.ANDERSON, oE SAME PLAoE.

Flt-res.

SPECIFICATION forming art of teeters Patent No. 653,160, dated July3,1900.

Application filed November 21, 1899. Serial No. 737,7 l9. (llo model.)

To all whom it may concern:

Be it known that I, J AMEs E. WILLIAMSON, a citizen of the'UnitedStates, residing in the city, county, and State of New York, haveinvented certain new and useful Improvements in Filters and otherDevices, of which the following is a specification.

My invention relates to cleaning apparatus for filters, and is designedto overcome the defects existing in these devices as heretoforeing-tank, which are provided with upwardly pro ecting nozzles, eachnozzle having a sievelike cap. To complete the operation of cleaning, acurrent of air is preferably forced through the filtering material afterit has been flushed with water, the air serving to oxidize anyimpurities which may still remain in the mass or to effect a certainscouring of the material. It is imperative that the air-currents shouldpermeate the entire mass, the same quantity of air being forced througheach nozzle. If the air were to be conducted through thesame pipe asthat which conducts'the Water in the filter as ordinarily constructed,the major portion of it would all escape through those nozzles whichare nearest the main pipe, because of the large cross-sectional area ofthis pipe and of the nozzles. Ithas therefore been found desirable toemploy a second system of piping for the air, consisting of tubes ofsmaller diameter placed inside of the wate'r-pipes. My invention isdesigned to do away with this second system of piping, and this end isaccomplished by the peculiar construction and arrangement of partsillustrated in the accompanying drawings, in which- Figure 1 is across-section through a filter on line X X in Fig. 2. Fig. 2 is a planview of the filter, showing the arrangement of the pipes and nozzles.Fig. 3 is a section through one of-the pipes, showing one of my improvednozzles in outline and one of the said nozzles in cross-section. Fig. 4.is a cross-section of Fig. 3 on the line Y Y. Fig. 5 is a view of amodified arrangement. Fig. 6 is a cross-section of Fig. 5 on line Z Z.Figs. 7 and S and Figs. 9 and 10,'respectively, are views of furthermodifications.

A in Fig. 1 represents the bed of filtering rections from the valves andunion.

While the operation of filtering is going on the valves 6, f, and g areclosed and the filtered water passes out through the valve 0.

D represents the supply pipe system, orovided with a water-pipe E andthe usual :regnlating-valve for maintaining the water at a constantlevel.

The valve 9 is connected to an air-supply pipe and the valve f to awash-pipe, through which pipes'airand water respectively may be forced.

As shown in Fig. 3, the nozzles or strainers d consist of a perforatedcap h and a tubular extension 2', provided with screw-threads Z. Betweenthese two parts is a hexagonal flange 7c, adapted to receive a wrenchfor the purpose of screwing the nozzles into the pipes O. The extension7; is made long enough to extend down intothe pipe to a considerabledistance. A small opening m is provided in the part i at a point insideof the pipe 0 for the purpose which .will be presently explained.

When the filter is to be cleaned, the valve 0 is closed and the valve fopened, thus causing a backflow of water under pressure through thepiping system and the nozzles and cleaning the filtering-bed. The valvef is then closed and the valve copened, so that the water oanbe drainedout. Enough water will remain in the pipes, however, to cause its levela to be higher than the lower opening of the nozzle extension '11, thusforming a IOO . complete water seal for this opening. After 'closing thevalve e the air-valve g is opened and the air rushes in under pressurefrom the air-supply. By reason of the water seal in the pipes it will beseen that the cross-sectional area through which the air may escape hasbeen reduced by the volume of water left in the pipes to the openings m,and the air is consequently forced to enter the nozzle through the smallingress-opening m. By this reduction of area a practically-evendistribution of the air-currents throughout the entire system isobtainable with any ordinarily-obtainable pressure of air. 5 In themodification shown in Figs. 5 and 6 the nozzles cl are inverted, so thattheir tubular interiors are sealed by the water left in the pipe. Theair-opening m is in this modification formed in the pipe instead ofbeing in the nozzle. Here, again, the water left in the pipe forms aseal for the nozzle, reduces the cross-sectional area through which theair must pass, and forces it to pass through the small openings m.

Figs. Tand 8 show a modification in which an approximately-rectangularpipe 0 is provided with a longitudinal central partitionwall 'r; whichextends to below the waterlevel. The nozzle or strainer 61 is hereplaced at one side of this partition-wall,.and a small opening m isformed in the top of the pipe at the other side of such wall. The Waterpasses through the full cross-section of the pipe, whereas the air-pipeis connected only with the right-hand side, and the air is thus forcedthrough the reduced section bounded by the water seal and passes outthrough the small openings m.

to that shown by Figs. 7 and 8. The entire pipe 0 is formed of a stripof sheet metal bent into the shape shown and provided at intervals withstrainers d", consisting of perforated circular bulges or projections 3,formed by stamping, which bulges are the equivalents of the nozzlesbefore described.

Other modifications Within the scope of my invention will readilysuggest themselves to the skilled mechanic, and I do not wish to limitmyself to the precise constructions shown.

What I claim as my invention,and desire to secure by Letters Patent, is

1. A system of piping, nozzles on the branches of said piping, anair-supply and a Water-supply leading into the piping, means for forminga water seal in the piping to restrict its cross-sectional area, and asmall air- Figs. 9 and 10 show a modification similar passage locatedabove said water seal, substantially as described.

2. A system of piping, an air-supply, and a water-supply connected tosaid piping, nozzles on the branches of said piping, and means forrestricting the cross-sectional area of said piping through which theair may pass, substantially as described.

3. A system of piping, an air-supply and a water-supply connectedtherewith, valves for controlling said air-supply and said watersupplyrespectively, a drain-pipe for allowing the water to escape, a valve forsaid drainpipe, nozzles on the branching of the-piping system,projections extending inwardly into the said piping, and air-passagessuitably located to allow the air from the air-supply to be forced out.

4. A system of piping suitably located under a bed of filteringmaterial, an air-supply and a water-supply connected with said piping,suitable means for controlling said airsupply and Watersupply, nozzleson the branches of the piping, and extensions on said nozzles projectinginto the pipes.

5. A system of piping located under a bed of filtering material,anair-supply and a Watersupply connected to said system of piping,suitable means for controlling the water-supply to form a water seal inthe piping, nozzles on the branches of said piping, extensions on saidnozzles projecting into the pipes and below the said water seal, andsmall air-passages in the sides of said nozzles above the water seal.

6. A nozzle consisting of a sieve-like cap, means for fastening thenozzle to a filter-pipe below said cap, and a tubular extension belowsaid fastening means.

7. A nozzle consisting of a sieve-like cap, means for fastening thenozzle to a filter-pipe below said cap,a tubular extension below saidfastening means, and an opening in the side of said tubular extension.

8. A nozzle consisting of a sieve-like cap, a flange below said cap, atubular extension below said flange, and external screw-threads formedon said tubular extension above its end, substantially as .described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

JAMES E. WILLIAMSON.

Witnesses:

GEORGE H. FRASER, THOMAS F. WALLACE.

IOO'

